linux-kernel - [PATCH v8 0/1] tpm: fix reference counting for struct tpm

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Date:   Tue,  1 Mar 2022 03:21:07 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc:     stefanb@...ux.vnet.ibm.com, James.Bottomley@...senpartnership.com,
        David.Laight@...LAB.COM, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, p.rosenberger@...bus.com,
        LinoSanfilippo@....de
Subject: [PATCH v8 0/1] tpm: fix reference counting for struct tpm_chip

This patch fixes a reference count issue in the TPM core code.

Changes in v8:
- adjust names of jump labels for error cases

Changes in v7:
- adjust naming of jump labels to fit better the used label naming scheme

Changes in v6:
- rename function tpm2_add_device() to tpm_devs_add() as requested by Jarko
- add function descriptions
- fix source code formatting

Changes in v5:
- move function tpm_add_tpm2_char_device() to tpm2-space.c and rename
it to tpm2_add_device() as requested by Jarko
- put "cc" tag before all other tags 
- ensure that the error path in tpm2_add_device() always calls 
the release() function of chip->devs as requested by Jason
- reformat a code line as suggested by David Laight

Changes in v4:
- drop patch 2 (tpm: in tpm2_del_space check if ops pointer is still
valid) since James Bottomley offered a cleaner solution for this
- reimplement patch 1 to setup the /dev/tpmrm device only in case of TPM2
and avoid the installation of another action handler. This is based on a
suggestion and basic implementation done by Jason Gunthorpe.
- added tag to CC stable

Changes in v3:
- drop the patch that introduces the new function tpm_chip_free()
- rework the commit messages for the patches (style, typos, etc.)
- add fixes tag to patch 2
- add James Bottomley to cc list
- add stable mailing list to cc list

Changes in v2:
- drop the patch that erroneously cleaned up after failed installation of
  an action handler in tpmm_chip_alloc() (pointed out by Jarkko Sakkinen)
- make the commit message for patch 1 more detailed
- add fixes tags and kernel logs


Lino Sanfilippo (1):
  tpm: fix reference counting for struct tpm_chip

 drivers/char/tpm/tpm-chip.c   | 48 +++++++-----------------------
 drivers/char/tpm/tpm.h        |  1 +
 drivers/char/tpm/tpm2-space.c | 55 +++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 38 deletions(-)


base-commit: 719fce7539cd3e186598e2aed36325fe892150cf
-- 
2.35.1